I just got my first 650 batt to make my mega more compact and it worked initially, but after charging all night it died within minutes. Then I charged it again, same thing. After that I decided to 5-click lock it before charging as a last resort to try it. It worked...I think. Has anyone heard of this or did my batt just "decide" to start working on its own? The green light STILL never comes on but I've been using it for hours today with no issues.